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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Richard Brown wrote: > Hi Grant > > On 13/03/07, Grant Sewell <dcglug@xxxxxxxxxxxx> wrote: >> On Sat, 10 Mar 2007 15:07:41 +0000 >> "Richard Brown" wrote: >> >>> Does it make a difference depending on connection speeds. There is a >>> difference between a hub and a switch. What speeds are your network >>> cards as well? 10/100 I wouldn't worry but if you have a 1000 then it >>> could make a difference. Just thought I would add these thoughts and I >>> don't suppose with two computers networked together it makes a whole >>> lot of difference. >> As a point of interest (well, to me)... you *cannot* have a gigabit >> ethernet hub. Gigabit over copper *must* use switches. 10mbps and >> 100mbps both support "half duplex" (why it's not called simplex, I do >> not know) communication where they can either talk, or listen, but do >> both simultaneously. For "full duplex" communication, the network >> devices are both talking and listening simultaneously, so in effect a >> 100mbps connection running at full duplex actually provides you with >> 200mbps bidirectional throughput. Gigabit ethernet, however, *must* >> operate at full duplex in order to reach the magic 1000mbps speed. >> Indeed, where-as on 10/100 networks using Cat5(e) only 2 pairs of >> cables are used, with 1000mbps networks all 4 pairs are being used >> simultaneously, in both directions. Each pair of cables on Cat5e has a >> (current) maximum potential throughput of 125mbps (apparently); 4 pairs >> of cables @ 125mbps/pair = 500mbps; 500mbps in both directions >> simultaneously = 1000mbps. Hubs do not support full duplex, >> whereas switches do; gigabit must use full duplex therefore gigabit >> cannot use hubs. >> > Thanks for pointing that out. Maybe you could add a further > enlightenment please? What is the difference between managed and > unmanaged switches (besides the spelling!). > > Thanks. managed switches are programmed in a particular way, it allows you to define (as an example) trunks.. which are multiple links from one switch to another... trust me, all hell it let loose if you plug two unmanaged switches together with 2 cables in to 2 ports... a trunk will multiply the available bandwidth from one switch to another.. But thats just one thing managed switches can do... there are loads of other things that they can do too.. - -- Neil Stone Systems Administrator FlashTek UK - -----BEGIN GEEK CODE BLOCK----- Version: 3.1 GIT d+(++) s: a-(?) C++++(--) UL++++$ P+ L+++ E- W+++ N+ o+ w--- O M PS+ Y+ PGP++ t+ 5+ X+ R+ tv+ b- DI++ D+++ G e h--- r+++ y++++(**) - -----END GEEK CODE BLOCK----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.2 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFF96Ujz3Av8JKgzxQRAvlrAJ9Rx2SY40jmxsSWpJNsuaQUPGA7SgCfao82 naJn1Cr2yLCj3e0sOAMaOsw= =lFXK -----END PGP SIGNATURE----- -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html